package com.atguigu.gulimall.product.service.impl;

import com.atguigu.gulimall.product.service.CategoryBrandRelationService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.atguigu.common.utils.PageUtils;
import com.atguigu.common.utils.Query;

import com.atguigu.gulimall.product.dao.CategoryDao;
import com.atguigu.gulimall.product.entity.CategoryEntity;
import com.atguigu.gulimall.product.service.CategoryService;
import org.springframework.util.CollectionUtils;


@Service("categoryService")
public class CategoryServiceImpl extends ServiceImpl<CategoryDao, CategoryEntity> implements CategoryService {

    @Autowired
    private CategoryBrandRelationService categoryBrandRelationService;

    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        IPage<CategoryEntity> page = this.page(
                new Query<CategoryEntity>().getPage(params),
                new QueryWrapper<CategoryEntity>()
        );

        return new PageUtils(page);
    }

    @Override
    public List<CategoryEntity> listWithTree() {
        //1,查出所有分类,null表示没有条件限制，即所有
        List<CategoryEntity> entities = baseMapper.selectList(null);

        //2,组装成父子的树形结构
        List<CategoryEntity> level1Menus = entities.stream().filter(
                categoryEntity -> categoryEntity.getParentCid() == 0
        ).map((menu) -> {
            menu.setChildren(getChildrens(menu, entities));
            return menu;
        }).sorted((menu1, menu2) -> {
            Integer sort1 = menu1.getSort();
            Integer sort2 = menu2.getSort();
            return (sort1 == null ? 0 : sort1) - (sort2 == null ? 0 : sort2);
        }).collect(Collectors.toList());

        return level1Menus;
    }

    @Override
    public void removeMenuByIds(List<Long> asList) {
        //TODO 1,检查当前删除的菜单是否被别的地方引用
        baseMapper.deleteBatchIds(asList);
    }

    @Override
    public Long[] findCatelogPath(Long catelogId) {
        List<Long> catelogPath = new ArrayList<>();
        findCateLogParentPath(catelogId,catelogPath);
        Collections.reverse(catelogPath);

        return catelogPath.toArray(new Long[catelogPath.size()]);
    }

    /**
     * 级联更新所有关联的数据
     * @param category
     */
    @Override
    public void updateCascade(CategoryEntity category) {
        this.updateById(category);
        categoryBrandRelationService.updateCategory(category.getCatId(),category.getName());
    }

    private void findCateLogParentPath(Long catelogId,List<Long> catelogPath){
        catelogPath.add(catelogId);
        CategoryEntity entity = this.getById(catelogId);
        if(entity.getParentCid() != 0){
            findCateLogParentPath(entity.getParentCid(),catelogPath);
        }
    }

    private List<CategoryEntity> getChildrens(CategoryEntity root, List<CategoryEntity> all) {
        List<CategoryEntity> children = all.stream().filter(categoryEntity -> {
            return categoryEntity.getParentCid() == root.getCatId();
        }).map(categoryEntity -> {
            categoryEntity.setChildren(getChildrens(categoryEntity, all));
            return categoryEntity;
        }).sorted((menu1, menu2) -> {
            Integer sort1 = menu1.getSort();
            Integer sort2 = menu2.getSort();
            return (sort1 == null ? 0 : sort1) - (sort2 == null ? 0 : sort2);
        }).collect(Collectors.toList());
        
        return children;
    }

}